I‘ve been to a lot of concerts, but I think I never paid more than 50€ for a show (and even that was an exception, think „Rancid is in Europe for the first time in 10 years!“). I guess I‘m not the typical concert-goer, because even IF RHCP (not hating or anything that‘s just the most recent example) offered cheaper tickets, I‘d still be in a giant stadium, 100‘s of meters from the stage. At that point, I might as well just watch the DVD.
EDIT: Forgot to get my point across: Concerts shouldn‘t be a big business, it‘s supposed to be about a connection between an artist and her fans.